Stud puller for rocker arms and the like



Oct. 27, 1959 s. M. WALRAVEN 2,999,835

- STUD FULLER FOR ROCKER ARMS AND THE LIKE Filed June 22, 1955 '1' T F/G. 3

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GEORGE M. WALRAVEN 62 4a 54 By 74 64 50 ATTORNEY United States Patent ice STUD PULLER FOR ROCKER ARMS AND THE LIKE George M. Walraven, Kenosha, Wis., assignor to Snap-On 4 Tools Corporation, Kenosha, Wis., a corporation of Delaware Application June 22, 1955, Serial No. 517,165

7 Claims. (Cl. 29-262) The improved stud pulling device comprising the present invention has been designed primarily for automouve use in connection with the pulling of rocker arm and other retaining studs from the sockets within which they are fixedly mounted. The invention is, however, capable of other uses and the present stud puller may, if desired, with or without modification, be employed for pulling or extracting studs and similar cylindrical or other rodlike members from their points of anchorage regardless of the use for which such members may be employed.

It is among the principal objects of the present invention to provide a stud puller which is extremely compact in its design and which consumes but little space yet which, despite its small size is rugged and durable and is capable of imparting to the stud or other member to which it is applied a high mechanical advantage sothat only a relatively small amount of torque need be applied to the operating member thereof to efiect the necessary dislodgment.

A similar and related object of the invention is to provide a stud puller of this type and which has a relatively small overall length, thereby enabling the same to be employed at locations where space is at 'a premium so that the device may be applied to studs and other objects despite the presence of overlying or neighboring obstructions which ordinarily would preclude application of conv'entional stud pullers thereto.

Another important object of the invention is to provide a stud puller which will accommodate the pulling of studs of varying length without requiring any preliminary adjustment of the device. Yet another object of the invention is to' provide a stud puller having associated therewith a novel form of stud-engaging member which, after initial engagement with the'stud, will, during pulling operations,'exert progressively increased clamping action on the stud for pulling purposes in direct proportion to the pulling load applied to the stud.

A further object of the invention is to provide a stud pullcrof this character which 'may be applied to the stud undergoing pulling and operated by the use of a single tool of conventional design such as an end, box or socket wrench thereby reducing the number of manual motions necessary to effect removal of the stud from its point of anchorage to a minimum.

Still another object is to provide a stud puller which is V 2,909,835 Patent d oer.- 27,; 9 59 In these drawings: I v

Fig. 1 is a front elevational view of a stud pulling device constructed in accordance with the principlesof the present invention. I

Fig. 2 is a bottom end view of the structure shown in Fig. 1. i

Fig. 3 is a sectional view taken substantially along the line 33 of Fig. 2.

Fig. 4 is a top plan view taken substantially along the line 44 of Fig. 1.

Fig. 5 is a sectional view taken substantially along the line 55 of Fig. 1. v

Fig. 6 is a sectional view taken substantially along'the line 66 of Fig. l and,'

'Fig. 7 is a sectional view similar to Fig. 3 showing the stud pulling device in operative studpulling position.

The structure selected for illustration is not intended to serve as a limitation upon the scope or teachings of the invention, but is merely illustrative thereof. There may be considerable variations and adaptations of all or part of the teachings of the invention depending upon the dictates of commercial practice.

The improved stud pulling device herein illustrated involves in its general organization a main body 10 which may be in the form of a casting. The body 10 as shown in Fig. 6 is generally in the form of a tubular member having a wall portion 12 which is arcuate in cross section and having an open side 14. The body member 10 is provided with a relativelythickftop wall 16 and the lower end of the member is adapted to be closed by means of a bottom plate 18 or base of appreciable thickness and having a marginalflauge 20 adapted toseat against the lower arcuate rim 22 of thebody member 10, The bottom plate. or base 18 is provid ed'with a-central opening 24 therethrou'gh in axiaLalignment with. the tubular body member lt} and through which opening the stud or other rod-like element which it-is desired to place under tension is adapted toypass when-the stud pulling device as a whole'is appliedthercto. P

The top wall 16.is provided with an opening therethrough in axial alignment with the .openiflgizf and comprised of a minimum number of parts, particularly an elongated tension applying screw 28 loosely pas ses through vthe opening 26 andprojects; downwardly into the chamber or enclosure 30 pr ovided by the body wall 12.. The extreme upperend of the body wall 12. is pro,- vided with a reduced extension;3 2 against whichthere is adapted, to seat a torqucereceivingnut '34- which is threadedlyreceived on the screw 28. I '1 The lower end of the screw28'has fixedlyreceived thereon a. vertically movable stud engaging and pulling carriage assembly 40 comprising a' body member 42 which may be in the form of a generally tubular casting having a vertical bore 44 extending therethrough. iThe upper end of the-bore 44 is enlarged and threaded asat 46 and tightly receives 'therein the lower. threaded ,end of the screw. 28.- The body 42 of the carriage 40 is formed with a pair of laterally extending spaced-arms'48 and 50 respectivelyhaving aligned openings 52and 54 formed therein. The opening. 52 isof less diameter than the opening 54' and is adapted to rotatably receivetherein the reduced end 56 of arock shaft which has been. designated in its entirety at 58, The rock shaft 58 further includes ahead portion 60 (Fig. 5) a second reduced cylindrical portion. 62 rotatably received in the opening 54, and an'intermediate reduced portion 64 which spans the distance between the two arm 48v and 50 and which is hexagonal in cross section. c q

I One face of the hexagonal intermediate portion 64 of the, rock shaft 58 is formed with a socket 66 therein, in which socket-there ismounted afspring pressed'detent 68 designed for cooperation with a recess 70 provided in one face of an eccentric hexagonal bore 72 provided in a cylindrical wedge member 74 having a knurled outer surface 76. The cylindrical wedge member 74 is telescopically received over the hexagonal intermediate portion 64 of the rock shaft 58 and in the assembled structure it assumes a position between the two arms 4-8 and 50.v

The head portion 60 of the rock shaft 58 is provided with a hexagonal socket 80 therein adapted to receive therein one end of a suitable torque applying tool or the like shown in dotted lines at 82 and by means of which tool the angular position of the eccentrically mounted knurled wedge member 74 may be altered. It should be noted that because of the fact that the three band-like areas 62, 64 and 56 decrease in diameter in the order named, the rock shaft as a whole may be readily inserted through the aligned bores 52 and 54 so that it will assume its assembled position with respect to the carriage 4t) whereupon it will be locked in position by means of the spring pressed detent 68 and recess 70. Similarly, the rock shaft 58 may be quickly removed from its as sociation with the carriage 40 simply by forcing the same to the right as viewed in Fig. 5 so that when the recess 70 is released by the detent 68, the parts will become separated.

In the operation of the device the same is oriented to such a position that the opening 24 in the base member or bottom plate 18 may be telescopically inserted over a stud intended for removal such as the stud shown in Fig. 7 or other rod-like member to which it is desired to apply tension. The upper end of the stud will extend into the bore 44 provided in the body member 42 of the carriage 40. The base member 18 is caused to seat upon the block or other machine element with which the stud is associated. After the body has been thus positioned Over the stud, the rock shaft 58 is rotated in a clockwise direction as viewed in Fig. 3 until the knurled side of the cylindrical wedge member 74 engages the side of the stud. Thereafter the nut 34 may be turned in a clockwise direction as viewed in Fig. 4 so as to cause the tension applying screw 28 to be forcibly lifted bodily upwardly thus elevating the carriage assembly 40 including the carriage body 42 and wedge member 74. Such upward movement of the carriage 40 serves to cause the Wedge member 74 to bite inwardly against the side of the stud with the degree of pressure between these two parts becoming increasingly greater as the tension in the screw 28 increases. This increasing degree of pressure between the knurled surface of the wedge member 74 and side of the stud prevents the carriage from pulling loose from the stud so that the latter ultimately is pulled upwardly and away from its anchorage in the member on which it is press-fitted therein. Should the stud be in threaded engagement with the body wherein it is anchored, then the body member 10, after the wedge-member 74 therein has an effective bite on the stud, is rotated in a counter-clockwise direction (viewed from the top of the body member 10) to remove a right-handed threaded stud. If a left-handed thread is involved, the body member 10 is rotated in the opposite direction.

While there has been illustrated and described a preferred embodiment of the invention it must be understood that the invention is capable of considerable modification without departing from the spirit of the invention. For example, although the pulling device of the present invention has been designed and illustrated in connection with the pulling of rocker arm studs of automotive engines, it is to be understood that the principles of the invention are adaptable to the application of tension to elongated objects of various descriptions as for example the tightening of wires, struts and the like. The invention therefore is not to be limited to the precise details of construction set forth and described and such modifications and variations as come within the scope of the appended claims may be taken advantage of if desired.

41 What is claimed is:

1. In a stud pulling device of the character described, in combination, a tubular casing having an internal axial chamber, there being a laterally extending slot formed in the side of said tubular casing and communicating with the internal chamber thereof, a tension screw projecting into said chamber through the upper end of the casing, a stud pulling carriage secured to the lower end of said tension screw and vertically movable Within the chamber, said carriage including a carriage body having an axial bore therein into which the projecting end of a stud is adapted to extend when the casing is aligned with and inserted over the stud, a laterally extending bifurcated support on said carriage body projecting outwardly through said slot, a wedge member having a stud engaging surface pivotally mounted on said bifurcated support and capable of swinging movement in the path of said carriage bore from a retracted position wherein it is out of engagement with the stud in said bore to an advanced position wherein it engages said stud, there being an aperture in the bottom of said tubular casing to guide and align the stud with the axial carriage bore, and a threaded member on said tension screw and engageable with the upper end of said casing for moving said stud, and consequently the carriage, axially within the chamber to apply tension to said stud.

2. In a device for pulling studs and the like from the support upon which they are mounted, a tubular casing having an internal axial chamber, there being a laterally extending slot formed in the side of said tubular casing and communicating with the internal chamber thereof, in combination, a tension screw projecting into said chamber through the upper end of the casing, a stud pulling carriage secured to said tension screw and vertically movable within said chamber, said carriage including a carriage body having an axial bore into which the projecting end of a stud is adapted to extend when the casing is telescopically received over the end of the stud with the lower end of the casing bearing against the stud support, a laterally extending bifurcated support on said carriage body projecting outwardly through said slot, a wedge member having a stud engaging surface pivotally mounted on said bifurcated support for swinging movement in the path of said carriage bore from a retracted position wherein said stud engaging surface is out of engagement with the stud in said bore to an advanced position wherein said surface frictionally engages the side of said stud, there being an aperture in the bottom of said tubular casing to guide and align the stud with the axial carriage bore, and a threaded member on said tension screw and engageable with the upper end of said casing for moving said stud, and consequently the carriage, axially in the chamber to apply tension to said stud.

3. In a device for pulling studs and the like from the support upon which they are mounted, the combination set forth in claim 2 wherein said wedge member comprises a cylindrical disk-like member having a knurled periphery engageable with said stud, said cylindrical member being rotatably mounted on said support for turning movement about an axis eccentric to the central axis of the member.

4. In a device for pulling studs and the like from the support upon which they are mounted, a tubular casing having an internal axial chamber, there being a laterally extending slot formed in the side of said tubular casing and communicating with the internal chamber thereof, in combination, a tension screw projecting into said chamber through the upper end of the casing, a stud pulling carriage secured to said tension screw and vertically movable within said chamber, said carriage including a carriage body having an axial bore into which the projecting end of a stud is adapted to extend when the casing is telescopically received over the end of the stud with the lower end of the casing bearing against the stud support, a pair of laterally extending arms on said carriage body projecting outwardly in parallel spaced relation through said lateral casing slot, a shaft supported at its ends between said arms, a wedge member having an arcuate stud engaging surface formed thereon, said wedge member being mounted on said shaft between said arms for swinging movement from a retracted position wherein said stud engaging surface is out of engagement with the stud in said bore to an advanced position wherein said surface frictionally engages the side of said stud, there being an aperture in the bottom of said tubular casing to guide and align the stud with the axial carriage bore, and a threaded member on said tension screw and engageable with the upper end of said casing for moving said stud, and consequently the carriage, axially in the chamber to apply tension to said stud.

5. In a device for pulling studs and the like from the support upon which they are mounted, the combination set forth in claim 4 wherein said wedge member comprises a cylindrical disk-like member having a knurled periphery engageable with said stud, said cylindrical member being rotatably mounted on said support for turning movement about an axis eccentric to the central axis of the member.

6. In a device for pulling studs and the like from the support upon which they are mounted, a tubular casing having an internal axial chamber, there being a laterally extending slot formed in the side of said tubular casing and communicating with the internal chamber thereof, in combination, a tension screw projecting into said chamber through the upper end of the casing, a stud pulling carriage secured to said tension screw and vertically movable within said chamber, said carriage including a carriage body having an axial bore into which the projecting end of a stud is adapted to extend when the casing is telescopically received over the end of the stud with the lower end of the casing bearing against the stud support, a pair of laterally extending arms on said carriage body projecting outwardly in parallelism through said lateral casing slot, a rock shaft pivotally supported between said arms, a wedge member having an arcuate stud engaging surface formed thereon, said wedge member being removably mounted on said shaft between said arms for swinging movement from a retracted position wherein said stud engaging surface is out of engagement with the stud in said bore to an advanced position wherein said surface frictionally engages the side of said stud, there being an aperture in the bottom of said tubular casing to guide and align the stud with the axial carriage bore, detent means releasably maintaining said wedge member on said rock shaft, and a threaded member on said tension screw and engageable with the upper end of said casing for moving said stud, and consequently the carriage, axially in the chamber to apply tension to said stud.

7. In a device for pulling studs and the like from the support upon which they are mounted, the combination set forth in claim 6 wherein said wedge member comprises a cylindrical disk-like member having a knurled periphery engageable with said stud, and having a noncircular opening therethrough, said rock shaft having a corresponding non-circular portion thereof projecting through and fitted within said non-circular opening.

References Cited in the file of this patent UNITED STATES PATENTS 

